From Chris Peirpoint

 Hi Cliff & Fran - this was about 600 m ESE from Crincoed Pt.  On 13-Dec-25 at 12:00 approx.  I was trying to sex them from the photo, but without any luck so far.  I was starting to imagine features, like a double genital slit on the left porpoise (male) and a possible penis on the aggressor (right).  Maybe Holly will know more.  I first thought it was a sexual approach - as in Holly’s paper.  But can’t be sure.  

There were no porps off Crincoed side when I arrived at 10:30 (flood), and first one (one of the two in photo I’m fairly certain) arrived from Pen Anglas at 11:35.  The second one arrived 10 min later.  They had this interaction then separated and both patrolled up and down ~200-500 m off Crincoed, sometimes under gannets, until 12:50, when they both moved back NW over to Pen Anglas and beyond.

 happy for you to use the pics for anything. 

Thanks Chris, yep this is something i have seen quite a lot over the years at this time of the year! I used to wonder if it was pwerhaps a female driving a weaned calf away, used to describe it as "Leapfrogging" Pretty sure it is sexual having seen more explicit pics taken by Ken!